What if Hitler decided that he would not release any naval assets against the Allies until after the fall of France in June of 1940?
So while Germany had all the same assets they went unused. No Uboats, no Raiders, no Magnetic Mines, nothing.
This would also assume that there was no attack against Denmark and Norway (since no Altmark incident) at least that Germany would initiate. If the UK invaded one of those nations how would that change the world view of the war?
What would the politics of this move have done to the UK and world opinion of Germany?
Not planning to try and blockade the UK = planning to not win WW2
Norway to the Germans and the British = iron ore via Narvik
The clash that triggered the subsequent events of the Norwegian campaign happened when HMS Cossack intercepted the Altmark in Norwegian waters
The Altmark was carrying British and Allied POWs taken by the Graf Spree and had taken refuge in Neutral Norwegian waters.
Despite the British asking the Norwegian Government to inspect the ship - the Norwegians only stopped it twice and asked if their were any POWs on board to which the captain said there was not.
While the transport of POWs through Neutral water is allowed - it should only be done where this no other option (ie Panama canal) and with the permission of the Neutral nation.
The British lost patience and stormed the vessel in a Norwegian Fjord resulting in the deaths of several German crew who resisted.
This Norwegian government somewhat embarrassed and stuck in the middle of 2 powerful nations allowed Cossack to leave with the POWs and then a day later allowed the Altmark to leave and return to Germany
Hitler believed that the Norwegians had taken the side of the British and subsequently invaded to secure the supply of Iron ore.
Without this incident which without raiders operating around the world would not have occurred we might not see the invasion happen like it did or when it did.
As for the British we might eventually see them try to do something about the winter supply of Iron ore - but this could include outbuying the Germans and securing it for themselves (simply in order to keep it from the Germans) rather than an outright hostile act.
Poor poor Norway.